I bought an NOS PTO as you describe from John Winslow about two years ago for $400. The PTO you describe is fairly rare as you need one if you have a dump with winch or wrecker. For a standard cargo or tractor (with no hydraulic mods) it is not worth any more than a standard PTO. So, if you find a guy who wants to install a winch on his dump or it is missing on his wrecker, you may be able to get $500. If a guy simply wants to put a winch on his tractor, there is no way that PTO is worth more than a few hundred bucks at the most. An entire winch kit for an M809 series truck can be had for a little over a grand.